Working light metals



Oct. 25, 1927.

J. E. HOY

WORKING LIGHT METALS Filed Nov. 15. 1926 INVEN TOR.

15/211 5. Hey BY Patented Oct. 25, 1927. V

UNITED STATES JOHN E. BOY, OF MIDLAND, MICHIGAN, ASSIGNOB TO THE DOW CHEMICAL COMPANY, OF MIDLAND, MICHIGAN, A CORPORATION OF MICHIGAN.

WORKING LIGHT METALS.

Application filed November This invention relates to the working of structural elements' of harder metal are also present; and it is among the objects of the invention to provide a method securing an.

adequate treatment of the light metal and at the same time an effective union between the respective elements. Other objects and advantages will appear as the description proceeds.

To the accomplishment of the foregoing and related ends, the invention, then, consists of the features hereinafter fully described, and particularly pointed out in the claims, the following description and the annexed drawing setting forth in detail but one of the various ways in which the principle of the invention may be employed.

In said annexed drawing:

Fig. 1 is a central vertical sectional view illustrating one way of carrying out the invention; and Fig.2 is a perspective view showing the resultant form of the article illustrated as undergoing the procedure.

The light metals, as magnesium, aluminum, and their alloys, while having many dominantadvantageous qualities, are of less strength than iron, and while immaterial in many uses, in some instances it is desirable to include the properties of both metals. If the light metal be, subjected to semiplastic flowage and compression, the inherent strength can be materially increased and the surface texture, density and finish greatlyimproved; and in the present invention, I subject the metal to compressive fiowage at the same time in relation with a structural'element of heavy metal.

In the illustrative form shown, a piston casting I, mounted on a dis-assemblable core 2 of any suitable construction is started into a die '3 and is forced through, for in stance by the blows of a power hammer on the cap 4. The piston blank 1 is provided with an annular shoulder 5 and an annular shoulder 6, and above the latter the head is of corresponding larger diameter, and rings 7 and 8 of iron or steel are carried by the blank abutting the respective shoulders.

With the rings 7 and 8 preliminarily as- 15, 1926. Serial No. 148,440.

sembled with the blank 1, each ring seated against its respective shoulder 5 and 6 and the metal heated to a temperature enabling eflicient working, e. g. GOO-900 F. in

the

instance of magnesium, the assemblage is forced along. The die or the blank, pref erably the die, has a taper, and the light metal is forced to flow into the space tween the rings 7 and 8 and be drawn into compact, smooth form, firmly embedding the rings,'-and presenting a dense tough face. In this manner, not only issurthe

strength of the light metal itself increased molecular rearrangement and ad'ustment, but the harder metal elements 0 the assemblage are united in effective unlon,

such that the surface presents a good w in finish. I

Vhile the process is particularly orkwell

adapted for the finishing of piston blanks, it is of course applicable to other articles where molecular flowage and a union with harder metal elements into a composite structure is to beaccomplished, and while iron or steel were instanced as the harder metal, it will be understood of course that other metals may be employed as desired.

Other modes of applying the principle of the invention may be employed, change being made as regards the details described,

provided the steps stated in any of the following claims or the equivalent of such be employed.

I therefore particularly point out and distinctly claim as inyinventionz- '1. In a method of the character described,

the steps which consist in assembling a light metal blank with an element of harder metal and die-drawing the assemblage to flow the light metal and at the same time embed the harder element;

2. In amethod of the character described,

the steps which consist in assembling a light" metal blank with spaced elements of hard metal and die-drawing the assemblage to flow the light metal and at the same time embed the hard elements.

3. In a method of the character described,

% a ace ring of hard metal antl die-drawin the assurface rings of hard metal and die-drawsemblage to flow the light metal a ong the ing the. assemblage to flow the light metal surface and at the same time embed the along the surface and at the same time em- 10 hard ring. bed. the hard rings.

4. In a method of the character described, Signed by me this 2nd day of November, I the steps which consist in assembling a 1926.

cylindrical light metal blank with spaced JOHN E. HOY, 

